<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div class="main">
        欢迎登陆系统！
        <form id="logout-id" th:action="logout" method="post">
            <input value="退出" type="submit">
        </form>
    </div>
</body>
</html>